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A multitouch table top computer from Microsoft that incorporates hand gestures and optical recognition of objects placed on the screen. Introduced in 2008 as the Surface computer with a 30" screen, the PixelSense's 40" screen is used without a mouse and keyboard and is large enough for group participation. In 2012, Microsoft acquired Perceptive Pixel Inc., the maker of these devices. See multitouch and Surface tablet.

An Electronic Light Table

Microsoft's PixelSense includes multitouch along with gesture and optical recognition. In this light table example, photos are being moved around as if they were printed on paper, but can also be resized using hand movements. (Image courtesy of Microsoft Corporation.)